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Formation Constants for the Ternary Complexes of Vanadium(III), 2,2′-Bipyridine, and the Amino Acids Histidine, Cysteine, Aspartic and Glutamic Acids

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Abstract

In this study we report the stability constants and the speciation of the ternary vanadium(III) complexes with 2,2′-bipyridine (Bipy) and the amino acids histidine (HHis), cysteine (H2Cys), aspartic acid (H2Asp) and glutamic acid (H2Glu) by means of potentiometric titrations employing 3.0 mol⋅dm−3 KCl as the ionic medium at 25 °C. The potentiometric data were analyzed taking into account the hydrolysis of the vanadium(III) cation and the respective stability constants of the binary complexes and the acid–base reactions of the ligands, which were kept fixed during the analysis. The complexes detected in the different systems are: in the vanadium(III)–Bipy–HHis system, [V(HBipy)(HHis)]4+ and [V(HBipy)(H2His)]5+; in the vanadium(III)–Bipy–H2Cys system, [V2O(Bipy)(Cys)]2+; in the vanadium(III)–Bipy–H2Asp system, [V(Bipy) (Asp)]+, [V2O(Bipy)(Asp)]2+, and V2O(Bipy)2(Asp)2; and finally in the vanadium(III)–Bipy–H2Glu system, [V(Bipy)(H2Glu)]3+ and [V(Bipy)(Glu)]+. The respective stability constants were determined and the specie distribution diagrams as a function of pH are briefly discussed.

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Acknowledgements

We acknowledge the Decanato de Investigación y Desarrollo (DID) from Simón Bolívar University for the financial support (Project S1-IC-CB-003-07). We acknowledge also Professors Antonio Barriola, Antonio Zapata, and Simón López from the Simón Bolívar University for their help during the work.

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  1. Departamento de Química, Universidad Simón Bolívar (USB), Valle de Sartenejas, Apartado 89000, Caracas, 1080 A, Venezuela

    Lino Hernández, Giuseppe Lubes, Mildred Rodríguez & Vito Lubes

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  1. Lino Hernández
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  2. Giuseppe Lubes
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  3. Mildred Rodríguez
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  4. Vito Lubes
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Correspondence to Vito Lubes.

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Hernández, L., Lubes, G., Rodríguez, M. et al. Formation Constants for the Ternary Complexes of Vanadium(III), 2,2′-Bipyridine, and the Amino Acids Histidine, Cysteine, Aspartic and Glutamic Acids. J Solution Chem 41, 840–848 (2012). https://doi.org/10.1007/s10953-012-9836-1

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  • DOI: https://doi.org/10.1007/s10953-012-9836-1

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